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Title: A numerical study of latent thermal energy storage in a phase change material/carbon panel

Abstract

To reduce the energetic dependence of building, it has become necessary to explore and develop new materials promoting energy conservation. Because of their high storage capacity, phase change materials (PCMs) are efficient to store thermal energy. In this paper, a 3D model was studied for simulation of energy storing cycles to predict the performances of PCM loaded panels. Carbon was used as supporting material for the PCM. The simulation was based on the enthalpy method using Ansys Fluent software. The panel was exposed to a daily heat flow including the effects of convection and radiation. The results show that the temperature decreased of approximately 2.5°C with a time shift about 2 hours. The steady state was reached after four cycles. Thus, after four cycles the PCM showed its effects on the temperature conditioning.

Authors:
; ;  [1];  [2]
  1. Research Laboratory of Process Engineering and Industrial Systems, National Engineering School of Gabes (Tunisia)
  2. IUT Senart, Department of Industrial Engineering and Maintenance, University Paris-Est (France)
Publication Date:
OSTI Identifier:
22608453
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1758; Journal Issue: 1; Conference: TMREES2016: Conference on technologies and materials for renewable energy, environment and sustainability, Beirut (Lebanon), 15-18 Apr 2016; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; CAPACITY; CARBON; CONVECTION; ENERGY CONSERVATION; ENERGY STORAGE; ENTHALPY; HEAT; HEAT FLUX; NUMERICAL ANALYSIS; PANELS; PERFORMANCE; PHASE CHANGE MATERIALS; SIMULATION; STEADY-STATE CONDITIONS

Citation Formats

Mekaddem, Najoua, E-mail: mekaddem.najoua@gmail.com, Ali, Samia Ben, E-mail: samia.benali@enig.rnu.tn, Hannachi, Ahmed, E-mail: ahmed.hannachi@enig.rnu.tn, and Mazioud, Atef, E-mail: mazioud@u-pec.fr. A numerical study of latent thermal energy storage in a phase change material/carbon panel. United States: N. p., 2016. Web. doi:10.1063/1.4959389.
Mekaddem, Najoua, E-mail: mekaddem.najoua@gmail.com, Ali, Samia Ben, E-mail: samia.benali@enig.rnu.tn, Hannachi, Ahmed, E-mail: ahmed.hannachi@enig.rnu.tn, & Mazioud, Atef, E-mail: mazioud@u-pec.fr. A numerical study of latent thermal energy storage in a phase change material/carbon panel. United States. doi:10.1063/1.4959389.
Mekaddem, Najoua, E-mail: mekaddem.najoua@gmail.com, Ali, Samia Ben, E-mail: samia.benali@enig.rnu.tn, Hannachi, Ahmed, E-mail: ahmed.hannachi@enig.rnu.tn, and Mazioud, Atef, E-mail: mazioud@u-pec.fr. 2016. "A numerical study of latent thermal energy storage in a phase change material/carbon panel". United States. doi:10.1063/1.4959389.
@article{osti_22608453,
title = {A numerical study of latent thermal energy storage in a phase change material/carbon panel},
author = {Mekaddem, Najoua, E-mail: mekaddem.najoua@gmail.com and Ali, Samia Ben, E-mail: samia.benali@enig.rnu.tn and Hannachi, Ahmed, E-mail: ahmed.hannachi@enig.rnu.tn and Mazioud, Atef, E-mail: mazioud@u-pec.fr},
abstractNote = {To reduce the energetic dependence of building, it has become necessary to explore and develop new materials promoting energy conservation. Because of their high storage capacity, phase change materials (PCMs) are efficient to store thermal energy. In this paper, a 3D model was studied for simulation of energy storing cycles to predict the performances of PCM loaded panels. Carbon was used as supporting material for the PCM. The simulation was based on the enthalpy method using Ansys Fluent software. The panel was exposed to a daily heat flow including the effects of convection and radiation. The results show that the temperature decreased of approximately 2.5°C with a time shift about 2 hours. The steady state was reached after four cycles. Thus, after four cycles the PCM showed its effects on the temperature conditioning.},
doi = {10.1063/1.4959389},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1758,
place = {United States},
year = 2016,
month = 7
}
  • This paper presents an analysis of a class of latent thermal energy storage (LTES) system. The analysis is based on a simplified model that allows the system performance to be evaluated in terms of a small set of parameters, while still retaining the main thermodynamic aspects associated with their operation. This analysis therefore permits the broad-based application potential of these systems to be viewed. The paper also discusses the applicability of the model to practical systems. This paper analyzes LTES with multiple energy storage cells and multiple phase-change materials (PCMs). The most general case of infinite energy storage cells andmore » PCMs is solved, for the charge process only, as well as for the overall charge-discharge process. The results yield the optimum phase change temperature, expressed as a continuous function of position along the LTES. The method is equally applicable to the case of a finite number of storage cells. An example of the application of the method to this case is also included. The results show the optimum phase change temperatures for each of the problems being considered, along with the corresponding optimum exergetic efficiencies. The solutions to the optimization problems are surprisingly simple to express, considering the difficulty of the problems, and indicate the potential advantages of using LTES with multiple PCMs.« less
  • A promising approach to increasing the energy efficiency of buildings is the implementation of a phase change material (PCM) in the building envelope. Numerous studies over the last two decades have reported the energy saving potential of PCMs in building envelopes, but their wide application has been inhibited, in part, by their high cost. This article describes a novel PCM made of naturally occurring fatty acids/glycerides trapped into high density polyethylene (HDPE) pellets and its performance in a building envelope application. The PCM-HDPE pellets were mixed with cellulose insulation and then added to an exterior wall of a test buildingmore » in a hot and humid climate, and tested over a period of several months, To demonstrate the efficacy of the PCM-enhanced cellulose insulation in reducing the building envelope heat gains and losses, side-by-side comparison was performed with another wall section filled with cellulose-only insulation. Further, numerical modeling of the test wall was performed to determine the actual impact of the PCM-HDPE pellets on wall-generated heating and cooling loads and the associated electricity consumption. The model was first validated using experimental data and then used for annual simulations using typical meteorological year (TMY3) weather data. Furthermore, this article presents the experimental data and numerical analyses showing the energy-saving potential of the new PCM.« less